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Every health care plan I've had (US, New York specifically) has covered optometry, is that unusual?

Same for me. It's always an add-on but same provider and policy.

This has been true with multiple providers on the east and west coast.

Yes, but the point is it is an add-on. Administratively (and in terms of deductible, etc.) it is different from the medical plan.

Yes, in the US at least.